Electric relay



BE$T AVAELABLE COPE April 20 1926.

5. E. GETCHELL ELECTRIC RELAY Filed 0ct. 25, 1924 INVENTOR SESTAVAlLABLE COPE Patented Apr. 20, 1926.

UNITED STATES 1,531,192 PATENT OFFICE.

BENJAMIN IE. GETCEEILL, OF PLAINVILLE, CONNECTICUT, ASSIGNOR TO THETBUM- BULL ELECTRIC MANUFACTURING COMPANY,

CORPORATION OF CONNECTICUT.

OF PLAINVILLE, CONNECTICUT, A

ELECTRIC RELAY.

Application and October 2;,1924. Serial No. 745,744.

7 '0 all whom it may concern:

Be it' known that I, BENJAMIN E. Gar- CHELL, a citizen of the UnitedStates of America,-residing at Plainville', county of i Hartford, Stateof Connecticut, have. invented a new and useful.Electric Relay, of whichthe following is a specification.

My invention relates to apro'tecting device particularly for motorcircuits intended to automatically open the circuit in case of adangerous continued overload. The present improvements reside in detailsof construction facilitating the proper assembly of the parts andassuringpermanency 5 and durability, and preventing tampering.

In its preferred form the device comprises improvements in theconstruction of m v former applications Nos. 573,965. 6:24.142,

and 669,304.

Figure 1 is a side vien ofia relay embodyin; the improvements of myinvention.

Figure 2 is a longitudinal sectional view of the same on a larger scale.

Figure I? is a transverse sectional view on the plane of the line 3-3 ofFigure 2, lookin in the direction of the arrow.

igure 4 is a plane figure of one part of the relay bodywith attachedmembers and omitting the end caps. i

Figure 5 is an end View showing the cap in lpartial section.

"igure 6 is.a detailed perspective view of an anchorage member. In thepreferred form the body of the relay is formed of twochanneldike'insultitlug members 7 and 8 held together by end caps t) and10 which are adapted-to fit into terminal clips such as are commonly em:ployed for cartridge fuses. Intermediate these terminal clips is anauxiliary contact 11 adapted to engage another stationary terminal ofthe apparatus designed to receive the rela Wit-hm the channel of thebody part 7 is mounted a bimetallic arm 12 adapted to be warped by heat.This member is secured ii1 place by means of a screw bolt 13 'and nut14. The resistance or heaterelement 15' is also anchored in place bythis same screw bolt'13 and has its opposite endsconneeted to the endcaps by means of screws 16 which pass through the end caps and intoanchorage blocks 17 so as to securely clamp the end of the heater,stripto the end cap. The anchorage block is shown as tapered at its 5 edgesto fit into correspondin g recesses in the insulating members 7 and 8and the ends 18 of the heater strip are bent over theedges of theseblocks 17. Preferably the ends 18 are provided with elongated holes19'so as to facilitate the passage of the screws 16. Each end cap has a,boss 20 indented and formed so as to .fit into a corresponding recess inthe ends of themembers 7 and 8 and thus resist rotation of the end capwith 5' respect to the body parts 7 and 8. I also preferably solder thescrew 16 in place as shown at 21 so as to prevent the screw from beingremoved. The angular recess formed in the outer end of the boss 20assists in anchoring the solder in place and preventin it from beingturned with the screw. 'ictu'cen the heater strip 15 and the base of thethermostatic arm 12 I insert one or more washer-s22 having the desiredpred'e- .termined rate of thermal-conductivity so as to control the timelag of the device and make it certain that a circuit will be opened thedesired number of seconds after the 'prcdesigned' overload has occurred.The Q contact screw 23 is mounted in an eyelet 24 and adjusted to theproper point for the particular relay. .The end of the screw is thencovered by a seal 25 preferabl of solder which is melted into the end 0the eyelet so as to prevent subsequent, alteration. in the setting ofthe screw. This eyelet 2% 'f also serves to secure the intermediatetar-f I minal 11 to the body part 7. Preferably the. heater strip 15 iscorrugated or crimped at 26 so as to concentrate its heating etl'ect ad-'acent the base of the thermostatic strip 12.

also prefer to provide an interm'ediate' shield in the form of. anasbestos strip the arm 12.

To additionally secure the end caps on 9 the body members I preferablyindent them or provide them'with interiorprojections,

28 ada ted to fit into grooves 29 'so as to give a ditional securityagainst rotation of, I

the end caps. It will thus be seen that'when' the-parts are onceassembled and the screws inserted in the channel of the member 7 95 16soldered in place, it is practically impossible for the user to take thedcviro apart, or tamper with the setting.

I claim 1. An clet-tric rolay comprising an insulating hotly foruwd oftwo parts. anrhoragc' memlwrs inmmtvd hotwu-n said parts. a heater striphaving its opposittends. ht-nt over said anchoragullttlllllt't's'. athnnnostativ switvh having a himvtallitinvinher scum-d to said heatt-rstrip. and. aps having introverted portions with non-riri-nlarrPrPsst-s. means for prevt-nting rotation of said raps on said body. andsrrcws runner-ting said body and srrows passing through said lmsm;

BEST AVAtLABLE C69! and sot-tiring thrill to said heatvr strip andsoldt-rcd in said rm-csscs. I

3. .\n electric relay. comprising a twopart insulating hody ha ving alongitudinal inttn'ior passage. :1 tltL'l'tlIOhiittitZ switch momm-dthrrcinand inrlndin; a hinwtalliiarm. a thi-rinal-transniitling nwmhcrin contain \vith'is'aid arm. a hvatvr strip having a portion in contaa'twith said transmittitr; member. a sqrew pa sing through saidhcate'rstrip. Paid transmitting: member. and said himvtalliv arm andthroughout: part of said body. an vivtvrnal nut for said srrt-n', thehead of said st-n-w holding: said hi-ah-r strip. said transmittingmHulu-r and mid hin'it-tallit: arm in rlnst mntart with varh otherrustxwtivvly. :mrhm'agv nit-mlu-rs mounted in said hod and havingsrre-u' srats the ends of said ht'atvr strip living limit I)\'('l'ontsidtof said-inn-lmragr inmnhcis and havin;, pas sum-s thl-rvto. c-ndaps swan-in tlu: parts of said hod)" togt-thcr. and s rvws t-xtvndingthrough :aid and vapsand through t-hv oppositrynds of sai l lwatvr stripand sw'ttt'in j lhvm to said anrhuragv nu-mlwrs.

'1. GETClll-ILL

